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What are the main ways of flue gas waste heat recovery
Article source: unknown Publisher: admin
First, waste heat recovery (gas-water)
The heat pipe waste heat recovery device is a special equipment for coal-fired, oil- and gas-fired boilers. It is installed in the boiler smoke port to recover the waste heat of the flue gas to heat domestic water or make-up water for the boiler. Its structure is shown in the figure: the lower part is a flue, the upper part is a water tank, and there is a partition in the middle. There are safety valve, pressure gauge and temperature gauge interfaces on the top, and the water tank has inlet and outlet water and sewage outlets. When working, the flue gas flows through the heat pipe waste heat returning flue to wash the lower end of the heat pipe. After the heat pipe absorbs heat, it guides the heat to the upper end, and the upper end of the heat pipe releases heat to heat the water. In order to prevent ash blocking and corrosion, the flue gas temperature at the outlet of the waste heat recovery device is generally controlled above the dew point, that is, the exhaust temperature of oil and coal-fired boilers is ≮130 ° C, and the exhaust temperature of gas-fired boilers is ≮100 ° C, which saves fuel by 4-18%.
Second, waste heat recovery (gas-gas)
The heat pipe waste heat recoverer is a special equipment for fuel oil, coal, and gas boilers. It is installed in the boiler flue or flue. It recovers the flue gas waste heat and heats the air. Its structure is shown in the figure: a tube box around, a middle partition to separate the channels on both sides, the heat pipe is a full finned tube, and a single heat pipe can be replaced. During operation, high-temperature flue gas flows upward from the left channel to wash away the heat pipe. At this time, the heat pipe absorbs heat, and the temperature of flue gas radiation decreases. The heat absorbed by the heat pipe leads to the right end, and the cold air flushes the heat pipe from the right channel downward, and at this time, the heat pipe releases heat, and the heat absorption temperature of the air rises. The flue gas temperature at the outlet of the waste heat recovery device is not lower than the dew point.
Finally, the waste heat ammonia water absorption refrigeration
The absorption refrigeration unit that uses ammonia as the refrigerant and water as the absorbent to circulate the solution is the ammonia water absorption refrigeration unit. Because ammonia is used as the refrigerant, the refrigeration temperature range is from -30 to 5 degrees, and the application range is very wide.
Related tags: waste heat recovery
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